期刊
JOURNAL OF NEUROSCIENCE
卷 26, 期 36, 页码 9216-9226出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.1491-06.2006
关键词
sensory coding; information theory; spike timing; trigeminal ganglion; barrel cortex; vibrissae
资金
- Telethon [GGP02459] Funding Source: Medline
- Wellcome Trust [066372/Z/01/Z] Funding Source: Medline
Rats achieve remarkable texture discriminations by sweeping their facial whiskers along surfaces. This work explores how neurons at two levels of the sensory pathway, trigeminal ganglion and barrel cortex, carry information about such stimuli. We identified two biologically plausible coding mechanisms, spike counts and patterns, and used mutual information to quantify how reliably neurons in anesthetized rats reported texture when decoded according to these candidate mechanisms. For discriminations between surfaces of different coarseness, spike counts could be decoded reliably and rapidly (within 30 ms after stimulus onset in cortex). Information increased as responses were considered as spike patterns with progressively finer temporal precision. At highest temporal resolution (spike sequences across six bins of 4 ms), the quantity of information in patterns rose 150% for ganglion neurons and 110% for cortical neurons above that in spike counts. In some cases, patterns permitted discriminations not supported by spike counts alone.
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